A.O. Smith BTH 300, Instruction Manual

Page 1: ... OPERATION SERVICE MAINTENANCE LIMITED WARRANTY WARNING If the information in these instructions is not followed exactly a fire or explosion may result causing property damage personal injury or death Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electr...

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Page 4: ...1 0 1 5 7 8 7 7 7 7 0 7 6 23 1 GENERAL SAFETY INFORMATION Read and understand this instruction manual and the safety messages herein before installing operating or servicing this water heater Failure to follow these instructions and safety messages could result in death or serious injury This manual must remain with the water heater Water temperature over 125 F 52 C can cause severe burns instantl...

Page 5: ... heater with any gas other than the gas shown on the rating label Fire Hazard Do not install water heater on carpeted floor Do not operate water heater if exposed to flooding or water damage For continued protection against risk of fire Fire and Explosion Hazard Leak test gas connections before placing the water heater in operation Disconnect gas piping at main gas shutoff valve before leak testin...

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Page 10: ...URE RISE INDICATED 0RGHO Type of Gas Input 7KHUPDO I FLHQF F 30 F 40 F 50 F 60 F 70 F 80 F 90 F 100 F 110 F 120 F 130 F 140 F Btu hr kW BTH 300 Natural 88 96 GPH 1164 873 698 582 499 436 388 349 317 291 269 249 Propane LPH 4404 3303 2643 2202 1888 1652 1468 1321 1201 1101 1016 944 BTH 400 Natural 117 95 GPH 1535 1151 921 767 658 576 512 460 419 384 354 329 Propane LPH 5810 4357 3486 2905 2490 2179...

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Page 47: ...UHVV 0 18 7KH 0DLQ 0HQX VFUHHQ ZLOO EH GLVSOD HG Tank Temperature 71 F Operating Setpoint 120 F Status Standby HELP MANUFACTURER MODEL INFORMATION MENU 7KH 0DLQ 0HQX LV ZKHUH DOO FRQWURO V VWHP PHQXV DUH OLVWHG VHH 7DEOH RQ SDJH IRU D FRPSOHWH OLVW DQG GHVFULSWLRQ RI FRQWURO V VWHP PHQXV 8VH WKH 8S DQG RZQ VOLGHEDU WR YLHZ DOO FRQWURO V VWHP PHQXV IURP WKH 0DLQ 0HQX 3UHVV 7HPSHUDWXUHV WR DFFHVV WK...

Page 48: ... 8 F Tank Temperature 120 F Tank Probe Offset 0 F HEATER STATUS MENU DESCRIPTION ACTION DISPLAY 3UHVV HDWHU 6WDWXV IURP WKH 0DLQ 0HQX WR HQWHU WKLV PHQX 7KLV PHQX FRQWDLQV QRQ DGMXVWDEOH RSHUDWLRQDO LQIRUPDWLRQ 8VH WKH VOLGHEDU WR QDYLJDWH WKH PHQX Status GLVSOD V WKH FXUUHQW 2SHUDWLQJ 6WDWH VHH 7DEOH RQ SDJH ECO Contact Low Gas PS Blocked Inlet PS Blocked Outlet PS Blower Prover PS GLVSOD V WKH F...

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Page 55: ...ter s rating label Overfiring could result in damage to the water heater and sooting Gas and carbon monoxide detectors are available 7KH ZDWHU KHDWHUV FRYHUHG E WKLV PDQXDO DUH FHUWLILHG IRU XVH ZLWKRXW PRGLILFDWLRQ IRU DOWLWXGHV XS WR IHHW 0RVW JDV XWLOLW FRPSDQLHV GH UDWH WKHLU JDV IRU KLJK DOWLWXGHV PDNLQJ LW XQQHFHVVDU WR LQVWDOO KLJK DOWLWXGH RULILFHV NOTE 7KH DFWXDO ILULQJ UDWH RI WKH ZDWHU ...

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Page 57: ...oint minus Differential setting a heating cycle is activated Spark Ignition Control is energized 24 VAC Gas Valve is energized gas flows to Main Burner Is flame sensed at the Main Burner control system monitors the flame sensor Control System Locks Out Displays Fault Msg NO Combustion Blower is energized Pre Purge cycle Control System performs diagnostic checks Normal State of all pressure switche...

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Page 65: ...RD LAYOUT CCB CENTRAL CONTROL BOARD 11 12 1 J16 J5 J3 J13 J4 J17 J10 J9 J14 J15 J1 J6 J12 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 7 7 8 8 8 9 9 7 10 8 Figure 57 ...

Page 66: ...66 WIRING DIAGRAM Figure 58 ...

Page 67: ... POWER WITH APPLIANCE AS THIS MAY CAUSE ELECTRICAL LINE NOISE AND LEAD TO ERRATIC CONTROL SYSTEM OPERATION Figure 59 CIRCULATING PUMP WIRING DIAGRAM DISHWASHER LOOP WITH TOGGLE SWITCH FIELD SUPPLIED TEMPERATURE CONTROL INSTALLED IN THE CIRCULATING LOOP RETURN LINE DISHWASHER TOGGLE SWITCH CIRC PUMP MOTOR L1 HOT L2 NEUTRAL 120 VAC POWER NOTE USE SEPARATE 120 VAC POWER SUPPLY FOR PUMP CIRCUIT DO NOT...

Page 68: ... TEMPERATURE WITH BUILDING RECIRCULATION NOTES 1 Preferred piping method 2 The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TEMPERATURE CONTROL PROBE DRAIN FULL POR...

Page 69: ...N NOTES 1 Preferred piping method 2 The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TEMPERATURE CONTROL PROBE DRAIN FULL PORT BALL VALVE MIXING VALVE TEMPERATURE G...

Page 70: ...ressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage 4 The tank temperature control should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the tank temperature control LEGEND TEMPERATURE PRESSURE RELIE...

Page 71: ...ure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage 4 The tank temperature control should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the tank temperature control LEGEND TEMPERATURE PRESSURE RELIEF VA...

Page 72: ...TES 1 Preferred piping method 2 The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TEMPERATURE CONTROL PROBE DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SW...

Page 73: ...rred piping method 2 The temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TEMPERATURE CONTROL PROBE DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK ...

Page 74: ... temperature and pressure relief valve setting shall not exceed pressure rating of any component in the system 3 Service valves are shown for servicing unit However local codes shall govern their usage WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS ANY MATERIAL COMPONENT OR VENDOR CHANGE MUST HAVE PRIOR ...

Page 75: ...g connections combustion air voltage wiring or fusing Failure to follow applicable codes Failure to follow printed instructions Improper installation sizing delivery or maintenance Claims related to rust noise smell or taste of water Failure to conduct authorized factory start up if required Alterations to the water heater Non outdoor heaters installed outdoors Damages due to a failure to allow fo...

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